The new isotopes258105,257105,254Lr and253Lr

  title={The new isotopes258105,257105,254Lr and253Lr},
  author={Fritz Peter Hessberger and Gottfried M{\"u}nzenberg and S. Hofmann and Y. K. Agarwal and Karola Poppensieker and Willibrord Reisdorf and K.-H. Schmidt and J. R. H. Schneider and William F. Schneider and H. J. Sch{\"o}tt and Peter Armbruster and Benjamin A. Thuma and C. C. Sahm and D. Vermeulen},
  journal={Zeitschrift f{\"u}r Physik A Atoms and Nuclei},
Evaporation residues from the heavy-ion fusion reaction50Ti on209Bi were investigated. They were separated from the projectile beam by the velocity filter SHIP and identified after implantation into an array of position-sensitive surface-barrier detectors by analyzing theirα-decay chains. Spontaneous fission was also observed.Four newα emitters,258105 (T1/2=4.4−0.6+0.9s),257105 (T1/2= 1.4−0.3+0.6s),254Lr (T1/2= 13−2+3s), and253Lr (T1/2=1.3−0.3+0.6s) could be identified. For the isotope257105 we… 
43 Citations

Spontaneous fission and alpha-decay properties of neutron deficient isotopes 257−253104 and 258106

Spontaneous fission and α-decay of253−257104 and 258106 were investigated in irradiations of 204,206,208Pb with 50Ti and 209Bi with 51V, respectively. New spontaneous fission activities were

Investigation of the fusion reaction 27Al+236U→263105 at excitation energies of 57 MeV and 65 MeV

The neutron-deficient isotopes 257,258105 were produced in the reaction 27Al+236U in 6n and 5n evaporation channels, respectively. The evaporation residues emerging from the target were separated

Observation of the isotopes264108 and265108

The experiment having led to the discovery of first isotopes of element 108, as published previously in Short Notes to this Journal [1, 2] are described and discussed in a final paper.Two isotopes of

Alpha-gamma decay studies of 258Db and its (grand)daughter nuclei 254Lr and 250Md

Abstract.The superheavy isotope 258Db was produced in the 209Bi(50Ti, 1n)258Db reaction at GSI, Germany. A detailed $ \alpha$α-spectroscopy study of this isotope and its $ \alpha$α-decay daughter

Investigation of electron capture decay of 258Db and $\alpha$α decay of 258Rf

Abstract.Electron capture decay of 258 Db was measured directly via delayed coincidences between K X-rays and/or conversion electrons (from the electron capture decay), and spontaneous fission or

Nuclear Data Sheets for A=254

  • Balraj Singh
  • Environmental Science, Physics
    Nuclear Data Sheets
  • 2019

Alpha-gamma decay studies of 261Sg and 257Rf

Abstract.The isotope 261Sg and its decay product 257Rf were produced in the nuclear reaction 208Pb(54Cr, n)261Sg . The radioactive decay of these isotopes was investigated by means of $ \alpha$ , $

The nuclear structure of heavy-actinide and trans actinide nuclei

▪ Abstract One can extract unique information about the nuclear interaction from the study of the heaviest elements. They exist solely on the basis of quantum effects, which create a barrier against

On the synthesis of 258Rf via p-deexcitation in the complete fusion reaction 50Ti + 209Bi

Abstract.Experimental data on evaporation residue production in the reaction 50Ti + 209Bi $\rightarrow$→259Db* measured at SHIP in the excitation energy range $ E^{\ast} = 11-31$E*=11-31 MeV were



Evidence for element 109 from one correlated decay sequence following the fusion of58Fe with209Bi

An experiment to synthesize element 109 is presented. Decay patterns characteristic of complete fusion products were searched for in an irradiation of209Bi targets with58Fe projectiles at specific

On the stability of the nuclei of element 108 withA=263–265

In bombarding209Bi and207, 208Pb targets by55Mn and58Fe ions the yields of “cold fusion” reactions have been determined using a sensitive technique for detectingT1/2≧1 ms spontaneous fission and

A new semiempirical formula for the alpha decay half-lives

2014 A new semiempirical relationship for the alpha decay life-time was derived on the ground of the fission theory of alpha decay. It takes into consideration explicitly not only the dependence on

A study of fusion reactions between206, 207Pb nuclei and40Ar ions near the coulomb barrier

Excitation functions for the reactions206Pb(40Ar, 2n)244Fm and207Pb(40Ar, 3n)244Fm have been measured and analysed in terms of a statistical model. The optical potential parameters have been found to

The identification of element 108

The aim was to produce element 108 by complete fusion of S'Fe with 2~ followed by evapora- tion of one neutron which leads to the odd mass isotope '6sI08', and to allow an unambiguous identi- fication of the new element in case of its a-decay, the unknown daughter isotope 2~I06 was investigated.

New Isotopes of Thorium Studied with an Improved Helium-Jet Recoil Transport Apparatus

Five neutron-deficient isotopes of thorium lighter than mass 218 were studied at the Berkeley Heavy Ion Linear Accelerator by bombardment of enriched $^{206}\mathrm{Pb}$ with $^{16}\mathrm{O}$.